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Fair Value Measurements
6 Months Ended
Jun. 30, 2011
Fair Value Measurements  
Fair Value Measurements
15.      Fair Value Measurements

Fair value standards under U.S. GAAP define fair value, establish a framework for measuring fair value in applying generally accepted accounting principles, and require disclosures about fair value measurements.  The standards also identify two kinds of inputs that are used to determine the fair value of assets and liabilities: observable and unobservable.  Observable inputs are based on market data or independent sources while unobservable inputs are based on the Company's own market assumptions.  Once inputs have been characterized, the inputs are prioritized into one of three broad levels (provided in the table below) used to measure fair value.

Fair value standards apply whenever an entity is measuring fair value under other accounting pronouncements that require or permit fair value measurement and require the use of observable market data when available.  As of June 30, 2011 and December 31, 2010, the Company did not have any financial assets or liabilities that were measured using unobservable (or Level 3) inputs.

The following tables provide fair value measurement information for the Company's major categories of financial assets and liabilities measured on a recurring basis (in millions):
     
Fair value measurements at reporting date using
 
December
31, 2010
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant other
observable
inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
               
Current assets:
             
Short-term investments
$1,752    
 
$1,737
 
  $  15 (1)
   
Other current assets (2)
$       5    
     
$    5   
   
Non-current assets:
             
Other assets
$     45    
     
$  45   
   
               
Current liabilities:
             
Other accrued liabilities (2)
$   155    
     
$155   
   
Non-current liabilities:
             
Other liabilities (2)
$     45    
     
$  45   
   

(1)
Short-term investments are measured using observable quoted prices for similar assets.